Sea View — Matsushima Bay

Today's Ocean Viewing Index and the six sub-indices behind it.

Ocean Viewing Index

Updated · Sep 8, 2026 17:48

Reference time: local noon · 11:46 (Asia/Tokyo)

Estimated
73
Good

Good conditions. Worth a visit.

Sub-Index Breakdown

Six dimensions feed the overall Ocean Viewing Index.

  • Sea Color
    Muted color · hue
    51.9
  • Clarity
    Moderately clear · NTU
    62
  • Visibility
    15+ m horizontal · m
    96.7
  • Sea State
    Calm, glassy (0-1) · Beaufort
    82.4
  • Lighting
    Golden hour, optimal · lux
    91.1
  • Water Quality
    index
    —

Sea Color

Observed Sep 8, 2026

Climatology
Blue-Green
#0891b2
Turbidity
7.00 NTU
Chlorophyll
1.15 mg/m³

FU=7, hue=133.5°, Kd490=0.244

Sea color through the day

The FU index represents the inherent color around local noon (closest to the true sea color); perceived color varies slightly by time of day with light and weather.

Morning08:00
Soft green-blue
#0d9488

Cloudy/hazy conditions darken the apparent color

Noon11:46
Natural sea color
#0891b2

Cloudy/hazy conditions darken the apparent color

Afternoon15:00
Deep blue
#2563eb

Cloudy/hazy conditions darken the apparent color

Dusk18:00
Deep indigo (low light)
#2563eb

Cloudy/hazy conditions darken the apparent color

Local noon · 11:46 (Asia/Tokyo)

7-Day OVI Trend

Forecast ocean viewing conditions for the coming week.

Best on Thu: Viewing conditions are Good; aim for the golden hour just after sunrise or before sunset. Great for snorkeling and photography.

7-Day Sub-Index Forecast

Six dimensions of ocean viewing quality over the coming week.

Sea Color
Tue
Wed
Thu
Fri
Sat
Sun
Mon
Sea color (Forel-Ule scale) — empty block means no verified data.